This chart is used to predict the sex of your child. Guaranteed 99% accurate. The chart was buried in a tomb near Beijing for 700 years. The original is in the Institute of Science in Beijing. All you need to know is the month in which the child was conceived, and the age of the mother when she is to give birth.
| Age | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 18 | F | M | F | M | M | M | M | M | M | M | M | M |
| 19 | M | F | M | F | F | M | M | F | M | M | F | F |
| 20 | F | M | F | M | M | M | M | M | M | F | M | M |
| 21 | M | F | F | F | F | F | F | F | F | F | F | F |
| 22 | F | M | M | F | M | F | F | M | F | F | F | F |
| 23 | M | M | M | F | M | M | F | F | F | M | M | F |
| 24 | M | F | F | M | M | F | M | F | M | M | F | M |
| 25 | F | M | F | M | F | M | F | M | F | M | M | M |
| 26 | M | M | M | M | M | F | M | F | F | M | F | F |
| 27 | F | F | M | M | F | M | F | F | M | F | M | M |
| 28 | M | M | M | F | F | M | F | M | F | F | M | F |
| 29 | F | M | F | F | M | F | F | M | F | M | F | F |
| 30 | M | M | F | M | F | M | M | M | M | M | M | M |
| 31 | M | M | M | M | F | F | M | F | M | F | F | F |
| 32 | M | F | F | M | F | M | M | F | M | M | F | M |
| 33 | F | M | M | F | F | M | F | M | F | M | M | F |
| 34 | M | M | F | F | M | F | M | M | F | M | F | F |
| 35 | M | F | M | F | M | F | M | F | M | M | F | M |
| 36 | M | F | M | M | M | F | M | M | F | F | F | F |
| 37 | F | F | M | F | F | F | M | F | F | M | M | M |
| 38 | M | M | F | F | M | F | F | M | F | F | M | F |
| 39 | F | F | M | F | F | F | M | F | M | M | F | M |
| 40 | M | M | M | F | M | F | M | F | M | F | F | M |
| 41 | F | F | M | F | M | M | F | F | M | F | M | F |
| 42 | M | F | F | M | M | M | M | M | F | M | F | M |
| 43 | F | M | F | F | M | M | M | F | F | F | M | M |
| 44 | M | F | F | F | M | F | M | M | F | M | F | M |
| 45 | F | M | F | M | F | F | M | F | M | F | M | F |